Prism Armasm

; Source: https://developer.arm.com/documentation/dui0473/c/writing-arm-assembly-language/subroutines-calls
        AREA subrout, CODE, READONLY ; Name this block of code
        ENTRY ; Mark first instruction to execute
start MOV r0, #10 ; Set up parameters
        MOV r1, #3
        BL doadd ; Call subroutine
stop MOV r0, #0x18 ; angel_SWIreason_ReportException
        LDR r1, =0x20026 ; ADP_Stopped_ApplicationExit
        SVC #0x123456 ; ARM semihosting (formerly SWI)
doadd ADD r0, r0, r1 ; Subroutine code
        BX lr ; Return from subroutine
        END ; Mark end of file